What to wear to an English wedding?

Hellllllllp! My sister in law (husband’s sister) is getting married in a week and a half and I can not figure out what to wear. I live in the states and don’t want to look out of place. I’m terrible at this sort of thing. Also, I only see my husband’s family about once a year and I’ll be meeting lots of people for the first time so I’d like to look nice. The wedding is at an old (renovated) estate and will be fairly formal. I’m 4 months post partum from a pregnancy where I gained 60ish pounds 😞 I’ve lost about half of it, so fairly self conscious as well. I’m currently about 175 and 5’8” if that helps with dress determination.

It probably has to be from amazon at this point because I have no time to go to stores and all the stores near me generally suck anyway. We leave early next week and the wedding is Saturday after next. It’s my sister in law’s wedding. Both of my kids will be in it (4 yo and 4 month old).

Must have a hat!

Bonus points for breastfeeding friendly, though that’s less important (I’ll just hide and extract myself somehow when necessary, lol).

Looking to stay around $100 all in (including hat and what not).

I originally thought fancy long dress, but am now thinking it’s too bridesmaidish. I’m currently thinking the dress below, but please tell me if it’s terrible. I’ll also post a pic of some of the long dresses I was looking at.

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